I'm going to post some calculations, not to make any particular point, but because everyone seems to be throwing around arguments based on assumed damage rates and it's skewing the direction of the discussion. It would be nice to be informed. I'm just doing Outrage for now, but I'll likely add Draco Meteor here as well for reference with Life Orb and Specs included.
NOTE: Please keep in mind Leftovers 6% recovery when considering differences between 2-3HKOs.
These calculations assume the following:
Salamence @ Life Orb
252 Attack EVs
Attack+ Nature
Outrage +1
Bronzong
252 HP EVs/252 Defense EVs
Defense+ Nature: 140 - 165 / 41.4% - 48.8%
Neutral Nature: 153 - 180 / 45.3% - 53.3%
Skarmory
252 HP EVs/252 Defense EVs
Defense+ Nature: 123 - 144 / 36.8% - 43.1%
Neutral Nature: 134 - 158 / 40.1% - 47.3%
252 HP EVs
Defense+ Nature: 147 - 173 / 44.0% - 51.8%
Metagross
252 HP EVs
Neutral Nature: 171 - 202 / 47.0% - 55.5%
252 HP EVs/252 Defense EVs
Defense+ Nature: 129 - 153 / 35.4% - 42.0%
Scizor
252 HP EVs
Neutral Nature: 216 - 254 / 62.8% - 73.8%
252 HP EVs/252 Defense EVs
Defense+ Nature: 155 - 183 / 45.1% - 53.2%
Jirachi
252 HP EVs/252 Defense EVs
Defense+ Nature: 155 - 183 / 38.4% - 45.3%
Magnezone
252 HP EVs/252 Defense EVs
Defense+ Nature: 141 - 166 / 41.0% - 48.3%
252 HP EVs
Neutral Nature: 191 - 225 / 55.5% - 65.4%
Forretress
252 HP EVs/252 Defense EVs
Defense+ Nature: 123 - 144 / 34.7% - 40.7%
Neutral Nature: 134 - 158 / 37.9% - 44.6%
252 HP EVs
Defense+ Nature: 147 - 173 / 41.5% - 48.9%
Heatran
252 HP EVs
Neutral Nature: 204 - 241 / 52.8% - 62.4%
If you wish to verify my numbers, refer to Metal Kid's Damage Calculator here:
http://www.metalkid.info/Pokemon/Calculators/Damage.aspx